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H fu r n is h e d m a t e r i a l o r s u p p lie s f o r th e work, out o f th e mon­eys due th e C o n tr a c to r on monthly o r o th e r e s t im a t e s , any sums due f o r la b o r , m a t e r i a l o r s u p p lie s fu r n is h e d in th e p e r fo rm ­ance o f th e work, and charge th e same t o th e C o n tr a c to r as so much p a id on t h i s c o n t r a c t ; and, b e f o r e a f i n a l s e tt le m e n t i s made between th e p a r t i e s h e r e t o for work done and m a t e r ia ls or s u p p lie s fu r n is h e d under t h i s c o n t r a c t , th e C o n tr a c to r s h a l l f u r n is h s a t i s f a c t o r y e v id e n c e t o th e R a ilr o a d Company th a t th e work i s f r e e and c l e a r from a l l l i e n s f o r la b o r , workmanship, m a t e r i a l and/or su p p liesan d th a t no c la im then e x i s t s in r e s p e c t t o which such l i e n s could a r i s e . The p a y ­ment f o r m a t e r i a l and s u p p lie s as r e f e r r e d t o i n t h i s s e c t i o n c o v e r s o n ly such m a t e r ia l as i s fu r n is h e d by th e C o n tr a c to r . The C o n tr a c to r a g re e s t o a c c e p t e x c l u s i v e l i a b i l i t y f o r th e payment o f any and a l l p a y r o l l ta x e s or c o n t r ib u t io n s f o r unemployment in su ra n ce or o ld age pensions o r a n n u itie s which a re measured by th e wages, s a l a r i e s , o r o th e r remunera­t i o n paid t o th e employees o f th e C o n t r a c to r . The C o n tr a c to r f u r t h e r a g re e s t o reim bu rse th e R a ilr o a d Company f o r any o f such o f th e a f o r e s a i d ta x e s and c o n t r ib u t io n s as by law the R a ilr o a d Company may be r e q u ir e d to pay. The C o n tr a c to r a g re e s t o comply w ith a l l v a l i d a d m i n i s t r a t i v e r e g u l a t i o n s r e ­s p e c t in g th e assumption o f l i a b i l i t y f o r th e a f o r e s a i d ta x e s and c o n t r ib u t io n s and th e su p p ly in g o f in fo rm a t io n t o th e p r o p e r l y d e s ig n a te d a u t h o r i t i e s . . S e c t io n 19. CONTRACTOR'S L IA B IL IT Y AND INSURANCE A l l I n j u r y t o th e work from f i r e s , f l o o d s , o r c a s u a l­t i e s o f e v e r y kind and/or lo s s o f m a t e r ia ls d u rin g c o n s t r u c ­t i o n , o c c u r r in g p r i o r t o th e f i n a l a ccep tan ce o f th e work by th e E n gin eer s h a l l be r e p a ir e d and/or r e p la c e d by and a t the expense o f th e C o n t r a c to r . During th e p r o g r e s s o f th e work, i f r e q u ir e d by th e E n g in eer, th e C o n tr a c to r s h a l l c a r r y , f r e e o f a l l c o s t and expense t o the R a ilr o a d Company, insurance a g a in s t f i r e and/or torn ad o on th e work, w ith in s u r e r s approved by the R a ilr o a d Company, w ith a c la u s e i n th e p o l i c i e s p r o v i d ­in g t h a t th e l o s s , i f any, on account o f f i r e and/or torn ad o s h a l l be p a y a b le t o th e C o n tr a c to r and th e R a ilr o a d Company as t h e i r i n t e r e s t s may appear a t th e tim e o f such l o s s . Any money r e c e i v e d by th e R a ilr o a d Company from such Insurance s h a l l be p a id t o th e C o n tr a c to r du rin g th e p r o g r e s s o f the work o f r e s t o r a t i o n perform ed by th e C o n tr a c to r upon such e s ­tim a te s and a t such tim es and under such terms as a re p r o v i d ­ed in S e c t io n 10 h e r e o f , i t b e in g u n derstood, however, t h a t th e C o n tr a c to r s h a l l c la im no a d d i t i o n a l compensation by r e a ­son o f such damage o r d e s t r u c t i o n , but the. E n gin eer s h a l l a l ­low such e x te n s io n o f tim e as may be r e a s o n a b ly r e q u ir e d by reason o f such damage or d e s t r u c t i o n . Sec. 20. CONTRACT MADE ON CONTRACTOR'S OWN KNOWLEDGE I t i s d i s t i n c t l y understood and d e c la r e d by th e Con­t r a c t o r th a t t h i s c o n t r a c t i s made f o r th e c o n s id e r a t io n h e r e ­i n named, s o l e l y on in fo rm a t io n d e r iv e d from o th e r s than th e R a ilr o a d Company, i t s o f f i c e r s , -agents or em ployees, and 9.